Rod-packing



(NQMOdeL) D. H. CHADD K.

ROD PACKING. v

Patented Oct. 15., 1889.

fig a UNITED STATES PATENT OFFICE.

DAVID lI. OIIADDAOK, OF CHICAGO, ILLINOIS.

ROD-PACKING.

SPECIFICATION forming part of Letters Patent No. 412,874, dated October15, 1889,

Application filed June 25, 1889.

To all whom it may concern.-

Be it known that I, DAVID E. OHADDACK, a citizen of the United States,residing at Ohicago, in the county of Cook and State of 111i nois, haveinvented certain new and useful Improvements in Rod-Packing, of whichthe following is a full, clear, and exact description, that will enableothers to make and use the same, reference being had to the accompanyingdrawings, forming a part of this specification.

This invention relates to improvements in metallic packing for pistonand valve rods, as will be hereinafter set forth.

Figure 1 is a longitudinal section of a stuffing-box and parts, showingthe relative position of the packing; Fig. 2, a longitudinal section ofthe packing-ring proper, and Fig. 3 a section of a cap-ring.

Referring to the drawings, A represents the stuffing-box, B thepacking-gland, and a a the bolts for adjustably securing the gland tothe stuffing-box. The packing-ring D is provided in the face of itsrespective ends with the annular V-shaped grooves a a and on itsperiphery with the wide channel (0*. The packing-ring is also providedwith the interior circumferential channel a corresponding to theexterior channel. It will be observed that this leaves but the narrowbearing-surfaces I) having contact with the rod. The exterior channel ais to facilitate the easy removal of the packing-ring, as thebearing-surface on the inclosing-walls of the stuffing-box is equal tothat on, the rod, so that when the back gland is removed a light puff ofsteam will force out the packing-ring. The cap-ring E is placed back ofthe packing-ring and has its side bearing against the packing-ringbeveled as at b, so as to extend a little way into the groove in thepacking-ring. The bevel on the cap-ring does not correspond to the angleof the sides of the groove a but is sharper, so as to have a bearingonly near the respective edges, and thuswedging more in an outwarddirection and leaving the space 12 between the cap and packing-ring. Thecap-ring is provided on the rear side with the annular shoulder b SerialN 315,566. (No model.)

d and a number of washers g mounted thereon. The object of this featureis to provide for the even setting up on the packing to compensate forthe wear, as by taking one of the washers from each bolt the gland willbe screwed in perfectly even and the packing and rod will wear on allsides alike, which is not possible under the ordinary arrangements. Bythis construction and mannor of applying the packing, a perfectly steamtight joint is formed and the friction reduced to the lowest possibleminimum.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A metallic packing-ring provided in its ends with annular grooves,and having channels in its outer and inner circumferential surface andleaving the narrow bearing-surfaces b, substantially as set forth.

2. The combination, with a metal packingring having inner and outercircumferential channels and the groove (t the cap-ringbeveled on theface and engaging with said groove and bearing against the outer edgesof the packing-ring, and spiral spring seated in the bottom of thestuffing-box and bearing against said cap-ring, substantially as and forthe purpose set forth.

3. The combination, with the packing-ring provided in its outer end withthe groove a, of the packing-gland having the inner joining end beveled,so as to wedge into said groove and spread the bearing-surface of thepacking-1 in g, substantially as and for the purpose set forth.

4. The combination,with a metal packingring provided exteriorly andinteriorly With panion groove in the packing-ring, substanchannels andhaving" V- shaped grooves in tially as and for the purpose set forth.the respective ends, as described, of the capring beveled t0 Wedge intosaid grooves, the DAVID I-I. OHADDAOK. spiral spring seated in thebottom of the \Vitnesses:

stuffing-box, and the packing-gland beveled L. M. FREEMAN,

on its inner end and Wedging into the 00m- L. B. OOUPLAND.

